package com.bootdo.common.utils;

import java.util.Random;

/**
 * @author bootdo
 */
public class StringUtils extends org.apache.commons.lang3.StringUtils{
	
	
	
	/**
	 * 生成订单号 格式:yyyyMMddHHmmss+四位随机数字 总长18位
	 * @return
	 */
	public static String generateOrderNO(String startW){
		StringBuffer sBuffer = new StringBuffer();
		sBuffer.append(startW);
		sBuffer.append(DateUtils.getCurrentTime2StringBySec());
		sBuffer.append(getRandomNumberByLength(4));
		return sBuffer.toString();
	}
	
	
	/**
     * 获取一定长度的随机字符串
     * @param length 指定字符串长度
     * @return 一定长度的字符串
     */
    public static String getRandomNumberByLength(int length) {
        String base = "0123456789";
        Random random = new Random();
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < length; i++) {
            int number = random.nextInt(base.length());
            sb.append(base.charAt(number));
        }
        return sb.toString();
    }
	
}
